How can you transfer details from high poly to low poly?
It's easy to fix. You just took the wrong baked image ;-)
Switch the Rendering workspace. There you can see all images in your scene easily. Check the dropdown list (Rendering result) and you'll see that &quot;hand_lp.001_normal.001&quot; is the correct baked normal map. In the Image Texture node you have selected &quot;hand_lp.001_normal.002&quot;, a black one. Just select the correct one.